How to Read a File as Byte Array?

package com.livrona.snippets.io;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;

import com.livrona.snippets.util.Log;

/**
 * A simple snippet that read a file as an byte array.
 * 
 * @author java4learners
 */
publicclass FileToArray {

privatestatic Log log =new Log(FileToArray.class);

/**
	 * Reads a file storing intermediate data into an array.
	 * 
	 * @param file
	 *            the file to be read
	 * @return a file data
	 */
publicstaticbyte[] read2array(String file) throws Exception {
		Exception ex =null;
		InputStream in =null;
byte[] out =newbyte[0];

try {
			in =new BufferedInputStream(new FileInputStream(file));

// the length of a buffer can vary
int bufLen =20000 * 1024;
byte[] buf =newbyte[bufLen];
byte[] tmp =null;
int len =0;

while ((len = in.read(buf, 0, bufLen)) != -1) {
				// extend array
				tmp =newbyte[out.length + len];

				// copy data
				System.arraycopy(out, 0, tmp, 0, out.length);
				System.arraycopy(buf, 0, tmp, out.length, len);
				out = tmp;
				tmp =null;
			}
		} catch (Exception e) {
			ex = e;
		} finally {
// always close the stream
if (in !=null) {
try {
					in.close();
				} catch (Exception e) {
				}
			}

if (ex !=null) {
throw ex;
			}
		}

return out;
	}

/**
	 * Test method
	 * 
	 * @param args
	 */
publicstaticvoid main(String[] args) {

if (args.length !=1) {
			System.out
					.println("Usage: java com.livrona.snippets.io.FileArray <Path file>");
			System.exit(0);
		}

try {
			log.debug("About to Read file : "+  args[0]);
byte[] contents = FileToArray.read2array(args[0]);
			log.info("File Size : "+ contents.length);
		} catch (Exception e) {
			log.error("Failed to read file : "+ e.getMessage(), e);
		}
	}
}